Automatic cam grinding machine



I Aug. 6, 1935. R. K. ROWELL AUTOMATIC CAM GRINDING MACHINE OriginalFiled March 6, 1926 14 Sheets-Sheet l INVENTOR. RKROu/ELL.

ATTORNEZ R. K. ROWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet 2 INVENTOR- HJfi'Ro WELL- Egg.

A TORNEY.

A118. 1935- R. K. ROVJELL Re. 19,663

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet 5 Fig.3.

IN VEN TOR.

R.K.R0mn.1..

\ Aq'TORNEK R. K. ROWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet 4 IN V EN TOR. EJt'. Ra WELL TTORNEY.

Fig.4.

Aug. 6, 1935. R. K, ROWELL AUTOMATIC CAM GRINDING MACHINE Original FiledMarch 6, 1926 14 Sheets-Sheet 5 Fig.5.

IN VENTOR. E. EHO WE'LL.

A TTORNEK R. K FZOWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet 6 INVENTOR. 1?.KROME'LL. BY

AT ORNEY R. K. ROVVELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet 7 IN V EN TOR. R. K.Romr1,/..

ATTORNEY.

Aug. 6, 1935. R, K HOWELL Re. 19,663

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14SheetsSheet 8 FiqlE.

mmvrox. RKEowL'LL.

5A rromm'.

R. K ROWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 1'4Sheets-Sheet 9 INVENTOR. Rjf. B one? 1 z.

A TORNEY.

Aug. 6, 1935. R. K ROWELL AUTOMATIC CAM GRINDING MACHINE Original FiledMarch 6, 1926 14 Sheets-Sheet 10 A ORNEY- R. K. HOWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet l1 K m Maw QIIIIIIIQER'II'IIIQ; I r 1 r INVENTOR. RJCBawLL.

\ A ORNEY.

R, K. HOWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDENG MACHINE Original Filed March 6, 1926 14Sheets-Sheet l2 INVENTUR. EKROWL'LL.

BY (a! I k A TRNEY.

1935. R, K HOWELL Re- 9,663

AUTOMATIC (1AM GRINDING MACHINE Original Filed March 6, 1926 14Sheeis-Sheet 13 A97 A55 A65 [N V EV TOR.

BY C

* ATTORNEY.

R. K. ROWELL Aug. 6, 1935.

AUTOMATIC CAM GRINDING MACHINE Original Filed March 6, 1926 14Sheets-Sheet l4 IN VEN TOR. Elf. [Bo WELL.

\ TTORNEY.

Reissuecl Aug. 6, 1935 UNITED STATES PATENT OFFICE AUTOMATIC CAMGRINDING MACHINE Original No. 1,675,466, dated July 3, 1928, Serial No.92,885, March 6, 1926. Application for reissue May 26, 1930, Serial No.455,936

66 Claims.

My said invention relates to an automatic cam grinding machine and it isan object of the same to provide means whereby an entire cam shaft canbe finished to size without any attention from the operator other thanthat required in starting and stopping the machine.

Another object is to provide means for rotating the master cam and thework in synchronism.

Another object is to provide a means for au tomatically feeding thewheel into the work at the proper speed and withdraw it when the work isfinished.

Another object is to provide means whereby the carriage is movedautomatically from a finished cam to the next blank as each cam isfinished, is stopped when the next blank is in front of the wheel, andis manually returned to the starting position when the entire camshaftis finished.

Another object is to provide improved means for reciprocating the wheelspindle in a line parallel with the carriage so as to give a smooth evenfinish to the work and also to reduce wheel wear.

Referring to the accompanying drawings which are made a part hereof andon which similar ref-- erence characters indicate similar parts,

Fig. 1 is a front elevation of the machine of my invention,

Figure 2, an end elevation of said machine viewed from the right,

Fig. 3, a front elevation showing the relative position of the mastercam and the cam shaft which is being ground,

Fig. 4, a partial longitudinal section of the wheel base and the part ofthe bed on which it rests,

Fig. 5, an end elevation of the rear part of the bed viewed from theleft and showing the wheel feeding motor,

Fig. 6, an end elevation partly in section showing the piping for thewheel feeding motor as seen from the right in Fig. 1,

Fig. 7, a front elevation partly in section showing the oil pump and thepiping to both the wheel feeding motor and the traverse motor,

Fig. 8, an end elevation of part of the traversing mechanism for thegrinding wheel carriage,

Fig. 9, an elevation of the valve operating lever used on the carriagetraversing mechanism, as seen from the left in Fig. 1,

Fig. 10, an elevation of a part of the mechanism for automaticallycontrolling the movement of the wheel base, as seen from the left inFig. 1,

Fig. 11, a horizontal section of said mechanism on line llll in Fig. 10,

Fig. 12, a front elevation of said mechanism,

Fig. 13, a right elevation of the foot stock,

Fig. 14, a. front elevation of said foot stock,

Fig. 15, a plan of said foot stock.

Fig. 16, a right elevation of the head stock partly in section showingthe method of rotating the work and the master cam in unison.

Fig. 17, a right hand elevation of the head stock 10 illustrating meansfor swinging the work toward and away from the wheel so as to grind thecam to the desired shape,

Fig. 18, a longitudinal section of the head stock,

Fig. 19, a longitudinal section of the wheel 15 spindle showing meansfor reciprocating the same,

Fig. 20, a cross-section on line 2ll20 of Fig. 19,

Fig. 21, a detail of gearing shown in Fig. 19,

Fig. 22, a front elevation partly in section of 20 the valve for thetraverse motor and the mechanism for operating said valve automaticallyto start and stop the traverse mechanism,

Fig. 23, a front elevation of the wheel feed motor, and

Fig. 24, a vertical longitudinal section of said motor.

In the drawings reference character 30 indicates the fixed bed of themachine which bed supports a work-carriage 3| mounted on guides 30 32for reciprocation lengthwise of the machine. The bed also supports aslide base 33 pivoted near its front end at 34 for movement toward andfrom the work located on the carriage 3| in front of the slide base. Thebed further supports a 35 fluid motor 35 by means of which the workcarriage is moved to and fro on the guides 32, a wheel feed motor 36 formoving the slide base 33 on its fulcrum 34 and various driving andcontrolling mechanisms hereinafter described.

Work supporting and driving means The work carriage 3| bears a table 31upon which a work supporting bracket 38 is mounted by pivots 39 formovement toward and from a 45 wheel 40 on a wheel base 4| slidinglysupported on the slide base 33 for adjustment toward and from the work,as to set the wheel and to compensate for wear. The bracket 38 and partscarried thereby are roughly triangular in cross sec- 50 tion with thework 42 supported at one corner of the triangle, the master cam shaft 43at another corner and the pivots 39 at the third corner. The position ofthe work is determined by a headstock 44 and a footstock 45 carryingrespectively centers 45 and 47. The position of the master camshaft isdetermined by a coupling 48 at one end and a coupling 49 at the otherend supported in the bearing 50.

Details of the headstock are shown in Figs. 16 to 18 together withdriving means connecting the headstock spindle 5| to a crankshaft 52which is connected by means of a lug 53 (Figs. 3 and 17) on the coupling48 to the camshaft. The headstock spindle is driven by a sprocket 54(Fig. 18) connected by a chain 55 to a sprocket 56 on the work driveshaft 51 (Figs. 1 and 2) which in turn is driven by a chain 58 from thechange speed shaft 59 operated at various speeds by change speed gearingin a casing 68, the speed being varied by means of a hand-lever BI. Thedrive shaft of the change speed gearing carries a pulley E2 driven by abelt 63 from a work drive pulley 54 on the main shaft 65, and providedwith a belt tightening idler 65. The headstock spindle is divided intotwo parts spaced from one another and provided with cranks 66 secured tothe respective sections by means of dowel pins 51, said cranks carryingcrank pins 68 fastened to the cranks by dowel pins 69. An intermediatecrank 66 is secured to the adjacent ends of the firstnamed crank pins insimilar manner. A work driver H1 is secured to the face plate of theinner spindle section adjacent the center 46.

The crankshaft 52 is provided with cranks and crankpins held together insimilar manner to the parts described in connection with the spindle 5I. Connecting rods II have bearings at opposite ends mounted on adjacentbearings of the crankpins, these connecting rods being arranged parallelto one another in well-known manner and serving to provide a smooth anduniform drive from the headstock spindle to the crankshaft 52 and henceto the master camshaft 43. It may be noted that the bracket 72 enclosingthe crankshaft 52 and providing bearings for the same is separate fromthe main bracket 38 and secured thereto by dowel pins and bolts but thisis uptional.

The footstock of the work-supporting mechanism is shown in detail inFigs. 13, 14, and 15. This iootstock comprises a center 41, a dust-cap13, a tension nut I4 for the spring 15 pressing against the rear end ofthe spindle I6, a pinion TI having spur teeth meshing with rack teeth onthe spindle, a pinion shaft 18 and a handle i9 by means of which thefootstock center can be retracted for convenience in dismounting andreplacing the work.

The master camshaft is provided with a series of cams corresponding inposition to those on the camshaft to be ground while the whole camshaftto be ground may be provided only with roughly shaped cam blanks whichmust be ground down to suitable shape. For oscillating the brackets 38to move the cam blanks toward and from the wheel during grindingoperations I have provided a roller 89 mounted in fixed relation on asupport secured to an upwardly projecting cover ill for the traversemotor which cover is fixed in relation to the base or bed 38. Thebracket is forced upward by springs 82 (Figs. 1 and 2) into a positionwhere one of the cams of the master camshaft will rest against theperiphery of the roller 80. It will be clear from the foregoing that asthe master camshaft rotates in synchronism with the camshaft beingoperated on the bracket 38 will be oscillated on its fulcrum 39 to movethe work toward and from the grinding wheel in a manner to governprecisely the shaping of the successive cams. When the work on a cam iscompleted the carriage is caused to travel a sufiicient distance in onedirection, e. g. to the left, to bring the next cam blank into operativerelation to the wheel. For thus traversing the carriage I have provideda means comprising the fluid motor 35 of which certain details are shownin Figures 1 and 22 and which may be understood to be otherwise of anysuitable type preferably having a vane mounted for oscillation betweentwo fixed abutments in a chamber provided with means for admitting fluidalternately at opposite sides of the vane. The motor drives a shaft 83carrying a pinion 84 whose teeth are in mesh with those of a rack 85 atthe under side of the carriage.

Grinding wheel feed It will be recalled that the grinding wheel iscarried by a. wheel base or wheel slide 4| mounted on a slide base 33pivotally supported at 34. For the purpose of adjusting the wheel basealong the slide base the slide base is provided with a rack 86 coactingwith a pinion 81 on a vertical shaft in the wheel base and rotation ofthe vertical shaft causes the wheel base to move along guides 88, on theslide base. The wheel spindle 90 is journaled in bearings 9| on thewheel base 4| and the spindle is driven by means of a. pulley 92 overwhich passes a belt 93 driven by a pulley 94 on the main shaft 65. Thisbelt is kept tight by an idle pulley 95 on a bracket pivoted at 34.

The wheel base and the slide base are tilted about their common axis 34for moving the wheel toward the work to compensate for the decreasingdiameter of the work by means comprising a roller 95 (Figs. 2 and 4)underneath the rear end of the slide base resting on a cam 91. The cam91 is splined to the shaft 98 of the wheel feed motor. such motor beinghereinafter referred to as the wheel feed motor. This motor has a vane99 on the shaft 98 arranged for oscillation in a chamber containing anabutment I which limits the movement of the vane and through whichabutment fluid may be admitted to move the vane in one direction or theother thus rotating the cam 91 correspondingly. A reversing lever Ifllcontrols the fluid admission valve I02 of the motor which may be anysuitable type and is preferably slidable in a right line. A slide I03(Fig. 24) is connected by a roller I04 and a pin I to the lever IOI foroperating the valve. The pin also carries a roller I06 bearing on adetent H5 supported at opposite ends by springs I08 so as to force thelever II toward one or the other extreme of its movement. One purpose ofthis construction is to cause the wheel to retreat quickly from the workwhen a cam is finished.

Automatic controlling means In order that the traverse may be madewithout injury to the wheel or the work it is necessary that one or theother be moved so far from the other in a direction respectively forwardor back as to avoid any danger of the work striking the wheel during thetraverse. With this object in mind I have provided interconnectedcontrolling means for the work carriage and the wheel feed includingmeans adapted to act on a forward projection or roller bar I09 of thebracket 38 in a manner to impart an abnormal swinging movement to thebracket in a direction for retracting the work from the wheel. Thismechanism is illustrated in detail in Figs. 4, 5 and 8 to 12.

A dog I Ill is mounted on the periphery of a dogwheel I l I and isadjustable about such periphery V the path of movement of the lever.

by means of a worm -I I2 having threads engaging teeth indicated at II 3on the outer rim of the wheelf This dog is adapted to strike a lug H4 onthe lever IBI, as the work feed motor moves clockwise in Fig. 5, forswinging the lever until the roller I05 passes the point of the detentII5 whereupon the springs immediately force the lever over the remainderof the path of its movement and reverse the motor. Under circumstanceshereinafter described the lever IOI will be held from moving clockwiseto the required extent for reversing the movement of the wheel feedmotor by means comprising a stop H6 in The stop I I6 is adjustablelongitudinally through a rockarm H1 and is provided with a lock nut H8for looking it in adjusted position. The rockarm H1 is mounted on a rodH9 which is adapted to oscillate in bearings I20. At the front end ofthe rod II9 a rockarrn IZI is provided which rockarm is connected. by alink I22 to another rockarm I23 on a rockshaft I24 extending forwardthrough the bed of the machine, or to the right in Fig. 5. At itsforward end the shaft carries a rockarm I25 (Fig. 1) connected by a linkI26 (Figs. 1, and 12) to a rack I21 adapted to engage a pin I26 on arockarm I29 pivoted at I30 on a cover BI and provided at its forward endwith a roller I3! contacting with the roller bar I09 (Figs. 10 and 22)at the front end of the bracket 38. A spring I32 draws the arm I 28toward its uppermost position and a plunger I33 forced rearwardly by aspring 134 tends tomove the hook I35 into engagement with the pin I28 onsaid arm. A fixed abutment I36 (Figs. 10 and 12) on the cover SI has acam face cooperating with a cam face at I31 on the hook I35 to disengagethe same from the pin I28 when the parts are lifted sufliciently high byspring I32.

The dog-wheel III or other part moving therewith also carries a dog I38adjustable about the periphery of the dog-wheel by a screw I38, said doghaving a nose I35 pivoted at I40 for engagement with a lever I4I (Figs.4 and 5) pivoted at I42. The dog I38 acts on said lever as the traversemotor moves In a clockwise direction (Fig. 5) to trip the parts operatedby said lever the pivotal mounting of the nose permitting the dog topass the lever in the contrary direction of move- -ment of the traversemotor without changing its position. As here shown the dog moves fromthe solid line position of Fig. 5 to the dotted line position. The leverMI is connected by a link I42 to a lever I63 pivoted at IM and this inturn is adjustably connected at 45 to a rod I46 slidably mounted in abearing I61 and carrying a collar I48. A spring I49 surrounds the rodsaid spring bearing at one end against collar I48 and at the otheragainst bearing I41 and serving to move the rod and the partsconnectedtherewith normally to the right in Fig. 5 or toward the front of themachine. At its forward end the rod I46 is connected by suitable meanssuch as a bent lever to an upright rod I55 (Figs. 1 and 8) which in turnis connected at its upper end by a bent lever I5I pivoted at I52 to aslidable detent I53 impelled by a spring E54 in a direction to engageunder a lateral arm of a lever I55 (Fig. 22).

The piston I56 is slidably mounted in a cylinder I51 formed in the coverBI and is provided at its lower end with a roller I58 engaging the upperface of the roller bracket I69. At its upper end the chamber I51 has asingle port I59 opening into a valve chamber provided with an inlet portI60 (Figs. 1 and. 22) and an exhaust port IBI. A

balanced piston valve I62 is located in said valve chamber and saidvalve has a stem I63 adjustably connected to the lever I55 withprovision for lost motion. The lever I55 has a vertical arm and alaterally extending inclined arm provided at its outer end with a rollerI58. A double-acting spring-pressed plunger I65 is mounted approximatelyin line with said arm so as to force the lever toward its extremeposition in either direction of its movement. It will be seen that thedetent I53 and the plunger 165 will hold the lever I55 and the valve I62in the position indicated, so that piston I55 will not move until thedetent I53 is retracted. When this occurs the plunger I65 will force theroller I64 downward and move the valve so as to connect the port I59 tothe inlet port I66 whereupon the fluid will enter the piston chamber andforce the piston down thereby moving the bar I09 downward to tilt thework supporting bracket 38 away from the wheel.

It will be recalled that the work carriage has a step-by-stcp orintermittent traversing move ment for moving the camshaft so as to bringits successive cam blanks into the field of operation of the grindingwheel 40 and such movement is availed of for the purpose of returningthe work carriage bracket to working position. For this purpose thetraversing roller bar is provided with dogs I66 having forwardlyprojecting lugs I61 (Figs. 8, 9 and 22). The lever I55 is also providedwith 9. depending finger I69 terminating in a rearwardly projecting lugI68 adapted to cooperate with the lugs I61 in one position thereof (Fig.9). The finger I66 is pivoted on the lever at I10 in such a manner as toswing to one side in one relative direction of movement of the rollerbar and the lever thus avoiding injury to the relatively movable parts.A pin I1I limits the swinging movement of the linger in acounterclockwise direction. The lever I55 has a rockarm I12 pivotedthereon, with a roller I13 adapted to contact with the roller bar I09 asit rises. A spring I14 provides a yielding connection between therockarm I12 and a rigid finger I15, thus cushioning the action of theroller bar on the lever and the valve I62.

It will be seen from the foregoing that when the detent I53 is withdrawnthe lever I55 will be moved clockwise by the plunger I65 so as to openthe intake passage I66 to the chamber I51 and thus force the bar down soas to bring its lugs I61 to the level of the lug I68 on the finger I69.As bar I09 now moves to the right in Figure 22 with the work carriage,the appropriate lug I61 will strike the lug I68 (it being understoodthat the number of dogs I66 corresponds to the number of cam blanks onthe cam shaft 62). The movement of the carriage will now cause the leverto swing on its pivot in a counterclockwise direction and this will movethe balanced valve so as to shut oil the intake port I60 from the port559 and open a passage from outlet port I6I to port I59. At the sametime the spring-pressed plunger I65 is permitted to return into holdingposition relative to the lever The movements above described, initiatedby engagement of dog I38 with lever MI in Figure 5 are utilized togovern the operation of the traverse motor. When the bar I59 is forceddown by the pressure in the cylinder I51 it acts on a roller I16 (Figs.8 and 22) on a roller bracket I11 provided with a handle I18. The rollerbar is supported on a plunger I19 guided for up and down movement in aplunger bracket I80 on the cover M, the movement of the plunger beinglimited by a stop I8I engaging at its inner end in a slot havingparallel vertical branches I8I connected by a. horizontal cross-overportion. At its lower end the plunger bears on a laterally extending armI82 of a three-armed lever I83, the lowermost arm of which is connectedto the stem I84 of a balanced piston I85 in a chamber I88 which pistoncontrols the operation of the oscillatory traverse motor 35. It has notbeen deemed necessary to illustrate details of this motor as it is ofwell-known type and is shown in other pending applications.

As the roller bar I89 pushes the plunger I19 down and. moves the leverI83 counterclockwise the valve I85 uncovers a port I81 leading to anexpansion chamber at one side of the vane of the traverse motor andadmits fluid under pressure through an intake port I88 to said expansionchamber. Such movement of the valve also opens a passage from the portI89 to the outlet passage I98 of the motor for escape of fluid from thenon-working side of the motor. The contrary movement of the roller barand plunger permits a spring I9I to move the lever I83 in a clockwisedirection thus moving the valve I85 to the left to an extent sufficientonly to bring the valve into the position illustrated in Figure 22 wherethe entrance of liquid to either side of the motor, i. e., to either ofits two opposed expansion chambers, is prevented and thus any traversingmovement of the carriage during grinding is prevented.

When an entire camshaft has been completed and has been replaced by anew one the carriage must be returned to its original or startingposition and for this purpose the handle I18 is turned to the leftsufficiently to disengage the pin I8I from the shoulder between thebranches I8I' of the slot in which the pin moves. The plunger I19 maynow rise to the full extent of its movement and the lever I83 mayconsequently be moved in a counter-clockwise direction by the spring I9Ito such an extent as to open a passage from the inlet port I92 to theport I89 for moving the motor in a direction to return the work carriageto its original position. At the same time the valve opens a way fromthe port I81 to the outlet I98 to permit escape of fluid from thenonworking side of the traverse motor.

Pump

The device of my invention is provided with a rotary pump I93 driven bya sprocket chain I94 passing over a sprocket I95 on the pump shaft and asprocket I96 on the main shaft of the machine. The pump has an intakeI91 and a pipe i98 communicating with the inlet ports I88 and I92 of thetraverse motor and also with the inlet port I68 for the piston chamberI51. An exhaust pipe 93 returns the exhaust fluid from the ports E39 andI81 of the traverse motor and a pipe I99 returns exhaust fluid from theexhaust port IBI of the piston chamber to the reservoir 288 at thebottom of the machine. A manually operated valve indicated at 285 inFig. 1 serves to vary the supply of pressure fluid to the traverse motorwhen desired. A pipe 282 leads from the pipe I98 to the wheel feed motor38 and an exhaust pipe 283 brings back the exhaust fluid from said motorto the reservoir 298. A valve 284 is normally spring-pressed to closedposition. This valve provides a means whereby the operator can permitthe fluid to return temporarily to the reservoir without operating themotor and the valve may also provide for relief of excessive pressure sothat the speed of the pump need not be changed, nor need the pump bestopped because of temporary cessation of the operation of the machine.The valve is opened by the operator through the aid of the lever 22 I.

Wheel traverse It is found desirable to give a limited traverse to thegrinding wheel for reducing the wear on the wheel as much as possibleand to give a smooth even finish to the work. For this purpose thegrinding wheel spindle 98 is provided with a worm 286 meshing with teethon a pinion 281 which is loose on a shaft 288. The shaft has eccentricportions at each end engaging forks in levers 289 pivoted at 2). Theselevers are connected by means of links 2 to a bronze collar 2I2surrounding the shaft, said forks being pivoted to the collar at 2I3.The collar is held against endwise movement on the shaft by means of apair of washers 2I4, the washer at the left resting against a shoulderon the spindle and the washer at the right being held in place by a nut2E5. The gear 281 is caused to rotate with the shaft 288 by means of aclutch member 2H5 engaging a clutch face on the gear. A coiled spring 2tends to separate the clutch faces and a screw 2I8 having an outer handwheel 2I9 bears at its inner end against a pin 228 which is mounted atits ends in the clutch member 2 I 8 so that rotation of the hand wheelmoves said clutch member into engagement with the worm gear.

It will be seen that rotation of the spindle and the wheel will turn theworm gear 281 and the eccentrics rotating therewith thus swinging thelevers 289 through their connections to the collar 2 I2 moving the shaftendwise to a limited extent. This reciprocating motion may be stopped byseparating the clutch member 2I8 from the worm gear through the mediumof the hand wheel 2I9 and screw 2 I8.

Operation In the operation of my device a camshaft is placed between thework centers, as indicated in Figure 3, the work carriage having beenpreviously brought to its position farthest to the right so as to beginoperations on a cam blank. The starting lever 22I is now moved to theright to open the valve 284 and fluid under pressure passes to thetraverse motor, power being also applied to the wheel in ordinarymanner. The wheel feed motor rotates the cam 91 in a counter-clockwisedirection as seen in Figure 5, or clockwise as seen in Figure 2, theheadstock is driven as above described causing the bracket 38 to rock inaccordance with the contour of the master cam on the camshaft 43 and theoperation proceeds in ordinary manner until the cam is ground to thedesired size at which time the dog I38 strikes the pin II4 on lever IMand swings the lever in a counterclockwise direction to a position inwhich the upper end of the lever moves to the left of the position shownin Figure 5.

This shifting of the lever IN to the left, as referred to above,positions the valve I82 so as to admit fluid to that side of the wheelfeed motor, which will cause the motor to turn clockwise; that is, in adirection to lower the feed slide. The work carriage is now indexed andshifted to position the work for grinding the next cam. The clockwisemovement of the wheel feed motor will cause the dog I38 to move from thedotted line position in a counterclockwise direction to the full lineposition Where it will shift the lever IM and again reverse the" valvewhich reverses the motor and moves the grinding wheel away from thework. The pivoted end portion I39 of the dog permits the dog to pass thenose of the trip lever I4I without moving the same.

On the reverse movement of the motor the dog wheel is moved clockwiseand such movement continues until dog IIO strikes pin H6 and moves leverIM to the position indicated in solid lines in Figure 5 where it abutsagainst a stop II6 which prevents further movement of the lever for thetime being and cuts off the fluid from both sides of the motor. Justprior to the attainment of this position by the dog H0, the dog I38passed the nose of lever I 4| in a clockwise direction and thereforemoved said lever about its pivot I42. As a result of such movement thelever MI acting through the train of connections M2, I63, I46, I50 andI5I retracts the latch I53 from lever I55 (Fig. 22). Thereupon theplunger I65 acts on the lever through the roller I64 to move the valveI62 to the right and permit pressure fluid to enter the cylinder I51,moving piston I56 so as to force roller bar I05 down and so set thetraverse motor in operation to index the carriage by acting on arm I82of lever I63. The lateral movement of the bar with the work carriagecauses the next lug I61, which has now been lowered to the proper level,to strike lug I68 and tilt lever I55 out of the way of latch I53 whichthen is moved back to latching position by spring I54. At the same timethe lever moves the valve I62 to stop the flow of pressure fluid andopens the way to outlet I6l, thus permitting the piston I56 and the barI09 to rise. As the bar rises the spring IBI moves the lever I83 andvalve I65 so as to stop the traverse motor.

When the bar I09 is forced down it acts through roller I3I to lowerlever I29 until pin I28 is low enough to be engaged by hook I35, whenthe hook is moved into engagement with said pin. As the bar rises therod I26 is moved up and through the train of elements previouslydescribed, rocks shaft H9 to move stop H6 out of the way of lever IOIwhereupon the lever moves further over under the pressure of detent H5until it is in position to cause the motor to move in a clockwisedirection to again raise the slide base and so repeat the cycle ofoperations. Thus the wheel cannot be moved toward the work until thetraverse movement is completed.

It will be obvious to those skilled in the art that various changes maybe made in my device without departing from the spirit of the invention,and I, therefore, do not limit myself to what is shown in the drawingsand described in the specification, but only as set forth in theappended claims.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a bracket tiltable on an axis parallel to that of the wheel,means on said bracket for supporting a camshaft, and means including amaster camshaft for tilting said bracket, and means for tilting saidbracket away from the grinding wheel, substantially as set forth.

2. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a bracket tiltable on an axis parallel to that of the wheel,means on said bracket for supporting a camshaft, a master camshaftarranged parallel to the axis of said wheel, and a fixed follower on afixed support coacting with the cams on the master camshaft for tiltingthe bracket, and means for tilting the said bracket away from theginding wheel, substantially as set forth.

3. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a bracket tiltable on an axis parallel to that of the wheel,means on said bracket for supporting a camshaft, a master camshaftarranged parallel to the axis of said wheel, a follower on a fixedsupport coacting with the cams on the master camshaft for tilting thebracket, and resilient means serving to tilt the bracket and move thework toward the wheel, and additional means for tilting the bracket awayfrom the grinding wheel, substantially as set forth.

4. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, andan oscillatory fluid motor for driving said cam alternately in oppositedirections, substantially as set forth.

5. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, anoscillatory fluid motor for driving said cam alternately in oppositedirections, a traversing work carriage, and means for moving with saidmotor for controlling the movements of the work carriage, substantiallyas set forth.

6. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, anoscillatory fluid motor for driving said cam alternately in oppositedirections, a travers ing work carriage, means for moving the workcarriage step-by-step to bring successive cams into the field ofoperation of the wheel, and means operated by said fluid motor forcontrolling the step-by-step movements of the carriage, substantially asset forth.

7. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, anoscillatory fluid motor for driving said cam alternately in oppositedirections, a traversing work carriage, a fluid motor for operating saidcarriage, and means operated by said first-named fluid motor for settingthe second fluid motor in action at intervals to move the carriageintermittently in one direction, substantially as set forth.

8. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a. work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, anoscillatory fluid motor for driving said cam alternately in oppositedirections, a traversing work carriage, an oscillatory fluid motor foroperating said carriage, and means controlled by the first-named fluidmotor for putting the second-named fluid motor into and out of operationto move the carriage step-by-step in one direction, substantially as setforth.

9. A cam grinding machine comprising a rotary wheel, a traversing workcarriage, a tilting bracket on the work carriage, means for moving thecarriage intermittently to bring successive cams into the field ofoperation of said wheel, and means for tilting the bracket to preventinterference with said traversing movement including a fluid motor,substantially as set forth.

10. A cam grinding machine comprising s. rotary wheel, a traversing workcarriage, a tilting bracket on the work carriage, means for moving thecarriage intermittently to bring successive cams into the field ofoperation of said wheel, means for tilting the bracket to preventinterference with said traversing movement includin a fluid motor, wheelfeeding means including a fluid motor, and means operated by the wheelfeeding means in the extreme forward position of the wheel for settingthe first-named fluid motor in action, substantially as set forth.

11. A cam grinding machine comprising a rotary wheel, a traversing workcarriage, a tilting bracket on the work carriage, means for moving thecarriage intermittently to bring successive cams into the field ofoperation of said wheel, means for tilting the bracket to preventinterference with said traversing movement including a fluid motor,wheel feeding means including a fluid motor, means operated by the wheelfeeding means in the extreme forward position of the wheel for settingthe first-named fluid motor in action, and automatic means for puttingsaid motor out of action for a predetermined traverse of the workcarriage, substantially as set forth.

12. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, afluid motor for driving said cam alternately in opposite directions, atraversing work carriage, means for moving the work carriagestep-by-step to bring successive cams into the field of operation of thewheel, means ope ated by said fluid motor for controlling thestep-bystep movements of the carriage, the said means comprising a,reversing valve for said fluid motor, a bar mounted on said carriage,dogs adjustably secured to said bar, an arm operable by said dogs, and avalve movable to exhaust position by said arm whereby said reversingvalve is permitted to return to inoperative position, substantially asset forth.

13. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, afluid motor for driving said cam alternately in opposite directions, atraversing work carriage, means for moving the work carriagestep-by-step to bring successive cams into the field of operation of thewheel, means operated by said fluid motor for controlling thestep-bystep movements of the carriage, the said means comprising a barmounted on said carriage, dogs adiustably secured to said bar, areversing valve, and operative connection between said dogs and saidreversing valve to permit the return of said valve to inoperativeposition, substantially as set forth.

14. In a cam grinding machine, a rotary wheel, a tilting supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for tilting the wheel supporting means, afluid motor for driving said cam alternately in opposite directions, atraversing work carriage, a fluid motor for operating said carriage,means operated by said first-named fluid motor for setting the secondfluid motor in action at intervals to move the carriage intermittentlyin one direction, the said means comprising a dog wheel, an irreversibledog on said dog wheel, a retaining pin, operative connection between thesaid dog and the said retaining pin, the said operative connection beingadapted to withdraw the retaining pin when the motor operates in onedirection, a valve operating arm held in position by said pin, a springpressed plunger for operating the said arm, a valve controlled by saidarm, a piston operated by said valve, and a reversing valzle operated bysaid piston, substantially as set for h.

15. In a cam grinding machine, a rotary wheel, a support therefor, abracket tiltable on an axis parallel to that of the wheel, means on saidbracket for supporting a camshaft, a master camshaft arranged parallelto the axis of said wheel, and a fixed follower on a fixed supportcoacting with the cams on the master camshaft for tilting the bracket,and means controlled by movement of the wheel support to its rearmostposition for tilting the said bracket away from the grinding wheel,substantially as set forth.

16. In a cam grinding machine, a rotary wheel, a movable supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for moving the wheel sup-- porting means, afluid motor for driving said cam alternately in opposite directions, atraversing work carriage, and means moving with said motor forcontrolling the movements of the work carriage, substantially as setforth.

17. In a cam grinding machine, a rotary wheel, a movable supporttherefor, a work carriage, means on the carriage for supporting androtating a cam shaft, a cam for moving the wheel supporting means, afluid motor for driving said cam alternately in opposite directions, atraversing work carriage, means for moving the work carriagestep-by-step to bring successive cams into the field of operation of thewheel, and means operated by said fluid motor for controlling thestep-by-step movements of the carriage, substantially as set forth.

18. In a cam grinding machine, a rotary wheel, a movable supporttherefor, a work carriage, means on the carriage for supporting androtating a camshaft, a cam for moving the wheel supporting means, amotor for driving said cam alternately in opposite directions, atraversing work carriage, a fluid motor for operating said carriage, andmeans operated by said first-named motor for setting the said fluidmotor in action at intervals to move the carriage intermittently in onedirection, substantially as set forth.

19. A cam grinding machine comprising a grinding wheel, a supporttherefor, a work carriage, automatically operable means for moving thecarriage intermittently to bring successive cams into the field ofoperation of said wheel, a bracket tiltable on an axis parallel to thatof the wheel, means on said bracket for supporting a camshaft, a mastercamshaft for tilting said bracket, and means for moving said wheelsupport toward the work, substantially as set forth.

20. A cam grinding apparatus comprising a grinding wheel and a cam blanksupport which are relatively movable towards and from each other, meansincluding master cams to cause said relative movement to produce desiredcontours on various cam blanks, means to cause relative traversingmovement between the wheel and cam blanks to position the wheel inoperative relation with a given cam blank, and means to separate thewheel and the cam blank support before a new cam may be located inposition opposite to the wheel.

